I have solved this problem. The useradd program in chroot which from my company has been modified. It create a tmp file to record the last "max uid" when it be run first time. After that , -u option is disabled, and uid is read from that file and add 1. Just this casue the Error.
And the kojid startup problem is because i changed the localhost.localdomain to xxx.xxx when install OS. Resolve that is very easy, just add "hostname" to /etc/hosts Thanks for your help!!!
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